$_direction: (
  l: left,
  t: top,
  r: right,
  b: bottom
);
$_spacing-type: (
  m: margin,
  p: padding
);
$_display-value: (none, block, inline-block, inline, flex, inline-flex);
$_position-value: (relative, absolute, fixed);
$_flex-direction-value: (
  row: row,
  row-reverse: row-reverse,
  column: column,
  column-reverse: column-reverse
);
$_flex-wrap-value: (
  nowrap: nowrap,
  wrap: wrap,
  reverse: wrap-reverse
);
$_flex-justify-content-value: (
  start: flex-start,
  end: flex-end,
  center: center,
  between: space-between,
  evenly: space-evenly,
  around: space-around
);
$_flex-align-items: (
  start: flex-start,
  end: flex-end,
  center: center,
  baseline: baseline,
  stretch: stretch
);
$_flex-align-content: (
  start: flex-start,
  end: flex-end,
  center: center,
  between: space-between,
  around: space-around,
  stretch: stretch
);
$_cursor-value: (
  auto,
  default,
  none,
  context-menu,
  help,
  pointer,
  progress,
  wait,
  cell,
  crosshair,
  text,
  vertical-text,
  alias,
  copy,
  move,
  no-drop,
  not-allowed,
  grab,
  grabbing,
  all-scroll,
  col-resize,
  row-resize,
  n-resize,
  e-resize,
  s-resize,
  w-resize,
  ne-resize,
  nw-resize,
  se-resize,
  sw-resize,
  ew-resize,
  ns-resize,
  nesw-resize,
  nwse-resize,
  zoom-in,
  zoom-out
);
$_overflow-value: (visible, hidden, scroll, auto, inherit);
$_vertical-align-value: (baseline, top, middle, bottom, sub, text-top);
$_visibility-value: (visible, hidden, collapse);
$_float-value: (left, none, right);
